00867nam a2200205Ia 4500 CTU_227712 210402s9999 xx 000 0 und d 600 D278 De Camp, L. Sprague The heroic age of American invention L. Sprague De Camp Garden City, N.Y. Doubleday 1961 Before the current era of great scientific research laboratories, the great inventors, working for the most part as individuals in their own small laboratories, accomplished the great feats which have revolutionized our civilization. Here are the stories of those feats and the dramatic personal lives of the men. Nhà phát minh,Inventors Hoa Kỳ,United States dqhieu Trung tâm Học liệu Trường Đại học Cần Thơ